Add extra unit test
What does this MR do and why?
Adds a unit test for feature flag disabled case.
Screenshots or screen recordings
Nothing changed visually.
How to set up and validate locally
Run yarn jest ee/spec/frontend/security_dashboard/components/shared/vulnerability_report/vulnerability_report_spec.js
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #433099 (closed)